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Oiled filter is said to catch a little more debris than a dry filter. Oiled filter has to be maintained more. It has to be cleaned and re oiled. IMO there is no discernable difference between the dry and wet filters. A oiled filter needs more maintenance .When you re oil a wet filter you have to be careful to not put too much oil on it as it may ruin your mass air flow sensor. Dry filter you just use some compressed air, blow it off and re install it.
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